Hecla Mining Company Jan. 13 reported that its Greens Creek Mine in Southeast Alaska produced 10.5 million ounces of silver in 2020, a 6% increase over the 9.9 million oz produced the prior year and the highest annual production since the Idaho-based company bought full ownership of the operation in 2008.

Greens Creek attributed 77% of the 13.5 million oz of silver produced at all of Hecla's opera...